What is the purpose of the external equalizer on this model

it breaks the circuit to the gas valve as a safety measure while keeping the fan energized to cool the heat exchanger

S1-024-35355-000

Broad Compatibility: Specifically calibrated for Weil-McLain GV Series 4 units

Johnson Controls VA9104-AGA-3S Actuator 324846-701 What is the purpose ofThe Johnson Controls VA9104 AGA 3S Actuator is a professional grade solution designed for precise control of VG1000 Series ball valves in demanding HVACR environments. Built as a non spring return valve actuator, this unit delivers 35 lb in torque to manage DN15, DN20, and DN25 valves with high reliability. It operates on 24Vac power and supports both two position and floating control protocols. Unlike standard models, the AGA variant is a floating